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Yes, I changed the phases too, that is the next movie in the list:
http://bl831.als.lbl.gov/~jamesh/movies/index.html#phase
Sorry for not including the link to the parent page in my first post.
There are also movies for the impact of completeness (both random and
oscillation-induced), resolution, Rcryst and overloads. Overloads is
the scariest one of all.
Kevin's Book of Fourier is definitely a must-see for any
crystallographer. However, I thought it was interesting to see HOW
wrong phases, amplitudes, completeness or overloads can get before you
can't trace the map anymore. I made these movies to teach a class, but
ended up learning more that I had planned to teach!
-James Holton
MAD Scientist
Ethan A Merritt wrote:
On Friday 28 April 2006 08:37 am, Peter Adrian Meyer wrote:
demonstrates this funny non-linear relationship between Rcryst and map
quality. It was only after I made this movie that I realized maps
calculated with an Rcryst of 30% look pretty much exactly like maps
calculated with Rcryst of 10%. The movie was made with all calculated
data (perfect phases to 1.5A) and I just randomly corrupted the Fs and
re-scaleit-ed them back to the original, calculated set.
But did you change the phases?
If you are not familiar with Kevin Cowtan's marvelous demonstration
of using ducks and kittens to randomize phases or F's,
head right away to
http://www.ysbl.york.ac.uk/~cowtan/fourier/magic.html
All will become clear.
